Low temperature thermal conductivity of PVC

Year: 2006

Authors: Risegari L., Barucci M., Olivieri E., Ventura G.

Autors Affiliation: Section of Florence, INFN, Florence, Italy; Department of Mechanics, INFN, University of Florence, Florence, Italy; Department of Physics, INFN, University of Florence, Florence, Italy

Abstract: At very low temperatures, the tunnelling theory for amorphous solids predicts a thermal conductivity ? ? Tm, with m = 2. However, most of the data in the literature in the temperature range 0.1-1 K report an m < 2. We want to show that this discrepancy often disappears for T? 0 K. Here we report the case of Polyvinyl Chloride (PVC) whose thermal conductivity is known in the 0.2-100 K temperature range. A new technique is described which makes the measurement of the exponent m of the thermal conductivity independent of the spurious thermal power. Such technique is particularly useful for measurements of ? when working with a low power refrigerator. We carried out measurements down to 50 mK, obtaining a thermal conductivity ? = (1.8 ± 0.1) × 10-4T(2.05±0.05) W/cm K for our PVC sample below 120 mK. Journal/Review: JOURNAL OF LOW TEMPERATURE PHYSICS

Volume: 144 (1-3)      Pages from: 49  to: 59

KeyWords: Amorphous materials; Low temperature effects; Refrigerators; Thermal conductivity, Spurious thermal power; Tunneling theory, Polyvinyl chlorides
DOI: 10.1007/s10909-006-9222-8

Citations: 4
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